<template>
    展示MyLeft组件
    <div>
        count值为：{{ count }}
        <button @click="count++">+1</button>
    </div>
</template>
<script setup>
import { ref ,onMounted,onUnmounted,onActivated,onDeactivated} from 'vue';
const count=ref(0)
onMounted(()=>{
    console.log('MyLeft组件挂载')
})
onUnmounted(()=>{
    console.log('MyLeft组件卸载')
})
onActivated(()=>{
    console.log('MyLeft组件激活')
})
onDeactivated(()=>{
    console.log('MyLeft组件停用')
})
</script>